661862469 has 8 divisors (see below), whose sum is σ = 883744992. Its totient is φ = 440610800.

The previous prime is 661862437. The next prime is 661862471. The reversal of 661862469 is 964268166.

It is a happy number.

661862469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661862469 - 2⁵ = 661862437 is a prime.

It is a super-2 number, since 2×661862469² = 876123855741551922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661862419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155259 + ... + 159464.

It is an arithmetic number, because the mean of its divisors is an integer number (110468124).

Almost surely, 2^661862469 is an apocalyptic number.

It is an amenable number.

661862469 is a deficient number, since it is larger than the sum of its proper divisors (221882523).

661862469 is a wasteful number, since it uses less digits than its factorization.

661862469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315427.

The product of its digits is 746496, while the sum is 48.

The square root of 661862469 is about 25726.6878746565. The cubic root of 661862469 is about 871.4769772154.

The spelling of 661862469 in words is "six hundred sixty-one million, eight hundred sixty-two thousand, four hundred sixty-nine".